.outer{
    margin-right:auto;
    margin-left:auto;
    background-color:#dddddd;
    overflow:hidden;
}

.img,.outer{
    width:352px;
    height:220px;
}

#img-1{
    background-image:url("./img/1.jpg");
}

#img-2{
    background-image:url("./img/2.jpg");
}

#img-3{
    background-image:url("./img/3.jpg");
}

#img-4{
    background-image:url("./img/4.jpg");
}

.img{
    float:left;
}

#banner{
    transition:margin-left 2s;
}

.btn-tab{
    background-color: rgba(0, 0, 0, 0.04);
    margin-top: -32px;
    margin-left: 10px;
    margin-right: 10px;
    padding: 5px 20px;
    cursor: pointer;
    display: block;
    float: left;
    font-size: 18px;
    border: 1px solid transparent;

}
.btn-tab:hover{
    background-color: rgba(0, 0, 0, 0.16);
}
.tab-top{
    border-bottom: 1px solid #1606c6;
}
.tab-page{
    border: 1px solid #1606c6;
    border-top: none;
    background-color: rgba(0, 0, 0, 0.07);
    display: none;
}
.now{
    border: 1px solid #1606c6;
    border-bottom: 1px solid #FFFFFF;
}
.in{
    display: block;
}



